Startup circuit and power supply system integrated with same

Abstract

The invention discloses a startup circuit and a power supply system integrated with the same. Low-voltage power supply is produced by the startup circuit to be supplied to a reference voltage source in the system when the system is powered up, thereby avoiding use of high-voltage devices by the reference voltage source. After the system works normally, the startup circuit can be turned off completely, and no additional power consumption is needed. After the power supply system integrated with the startup circuit is applied, the reference voltage source in a chip can always maintain low voltage, and only one high-accuracy low-voltage reference source needs to be constructed in the chip. Therefore, due to high-voltage application of the power supply system, the number of the applied high-voltage devices can be reduced, the area of the chip can be reduced, and the design cost can be decreased.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to the design of a self-starting internal power supply system suitable for high-voltage applications. Background technique [0002] All chips have a power-on process, so it is inevitable to design the power-on process of the chip in chip design. Proper design can improve the performance of the chip and reduce the cost of the chip. The traditional chip power-on process is that the external power supply voltage Vin directly supplies power to the reference module, and then the internal power supply of the chip is established after the reference is established, and finally the chip can operate normally. This power-on process has two serious defects in high-voltage applications: ①Because the reference power supply is an external power supply voltage, a large number of withstand voltage devices are used in the reference part, which increases the chip area; Therefore, t...

AI Technical Summary

Problems solved by technology

This power-on process has two serious defects in high-voltage applications: ①Because the reference power supply is an external power supply voltage, a large number of withstand voltage devices are used in the reference part, which increases the chip area; Leakage current, so the reference voltage of the high voltage power supply has serious temperature drift, which will lead to serious drift of the internal reference voltage of the chip with temperature

Therefore, a high-voltage application chip using the traditional power-on process often needs to add an additional low-voltage high-precision reference source inside the chip to meet the needs of internal precise control, which will further increase the power consumption and area of ​​the chip

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